Post bug-report find: This was in the debian/NEWS for the package:
php5 (5.4.0~rc8-1) unstable; urgency=low
php5-fpm default www spool now listens on unix socket located
in /var/run/php5-fpm.sock instead of localhost:9000. If you
have configured your webserver to use localhost:9000, you will
have to change your settings.
Post bug-report find: This was in the debian/NEWS for the package:
php5 (5.4.0~rc8-1) unstable; urgency=low
php5-fpm default www spool now listens on unix socket located php5-fpm. sock instead of localhost:9000. If you
in /var/run/
have configured your webserver to use localhost:9000, you will
have to change your settings.
-- Ondřej Surý <email address hidden> Wed, 08 Feb 2012 08:25:30 +0100
I have not yet checked the release notes for the packages, however the changelogs did reference this change, as did this NEWS item.